2009 Toyota Matrix Service & Repair Manual
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SUPPLEMENTAL RESTRAINT SYSTEM – OCCUPANT CLASSIFICATION SYSTEM
RS–241
RS
DESCRIPTION
DTC B1786 is output when the occupant classification ECU receives a collision detection signal sent by
the front occupant classification sensor RH if an accident occurs.
DTC B1786 is also output when the front seat assembly RH is subjected to a strong impact, even if an
actual accident does not occur.
However, when the occupant classification ECU outputs a collision detection signal, even if the vehicle is
not in a collision, DTC B1786 can be cleared by "Zero point calibration" and "Sensitivity check".
Therefore, if DTC B1786 is output, first perform "Zero point calibration" and "Sensitivity check".
WIRING DIAGRAM
See page RS-213.
INSPECTION PROCEDURE
(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Using the intelligent tester, perform "Zero point
calibration" (See page RS-187).
OK:
"COMPLETED" is displayed.
NG
OK
(a) Using the intelligent tester, perform "Sensitivity check"
(See page RS-187).
Standard value:
27 to 33 kg (59.52 to 72.75 lb)
NG
OK
(a) Turn the ignition switch to the ON position.
(b) Clear the DTCs stored in the memory (See page RS-
194).
DTC B1786
Front Occupant Classification Sensor RH Colli-
sion Detection
DTC No. DTC Detection Condition Trouble Area
B1786
• Front seat back assembly RH malfunction
• Occupant classification ECU malfunction
• Front occupant classification sensor RH detected a
large load
• Front seat back assembly RH (Front occupant
classification sensor RH)
• Occupant classification ECU
1 PERFORM ZERO POINT CALIBRATION
Go to step 4
2 PERFORM SENSITIVITY CHECK
Go to step 4
3 CHECK DTC
RS–242
SUPPLEMENTAL RESTRAINT SYSTEM – OCCUPANT CLASSIFICATION SYSTEM
RS
HINT:
First clear DTCs stored in the occupant classification
ECU and then in the center airbag sensor assembly.
(c) Turn the ignition switch to the LOCK position.
(d) Turn the ignition switch to the ON position.
(e) Check the DTCs (See page RS-194).
OK:
DTC B1786 is not output.
HINT:
Codes other than DTC B1786 may be output at this time,
but they are not related to this check.
OK
NG
(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the negative (-) terminal cable from the
battery.
(c) Replace the front seat assembly RH (See page SE-12).
HINT:
Perform the inspection using parts from a normal vehicle
if possible.
NEXT
(a) Connect the negative (-) terminal cable to the battery.
(b) Connect the intelligent tester to the DLC3.
(c) Turn the ignition switch to the ON position.
(d) Using the intelligent tester, perform "Zero point
calibration" (See page RS-187).
OK:
"COMPLETED" is displayed.
NG
OK
(a) Using the intelligent tester, perform "Sensitivity check"
(See page RS-187).
Standard value:
27 to 33 kg (59.52 to 72.75 lb)
NG
OK
END
4 REPLACE FRONT SEAT BACK ASSEMBLY RH
5 PERFORM ZERO POINT CALIBRATION
Go to step 8
6 PERFORM SENSITIVITY CHECK
Go to step 8
SUPPLEMENTAL RESTRAINT SYSTEM – OCCUPANT CLASSIFICATION SYSTEM
RS–243
RS
(a) Turn the ignition switch to the ON position.
(b) Clear the DTCs stored in the memory (See page RS-
194).
HINT:
First clear DTCs stored in the occupant classification
ECU and then in the center airbag sensor assembly.
(c) Turn the ignition switch to the LOCK position.
(d) Turn the ignition switch to the ON position.
(e) Check the DTCs (See page RS-194).
OK:
DTC B1786 is not output.
HINT:
Codes other than DTC B1786 may be output at this time,
but they are not related to this check.
OK
NG
(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the negative (-) terminal cable from the
battery.
(c) Replace the occupant classification ECU (See page RS-
332).
NEXT
(a) Connect the negative (-) terminal cable to the battery.
(b) Connect the intelligent tester to the DLC3.
(c) Turn the ignition switch to the ON position.
(d) Using the intelligent tester, perform "Zero point
calibration" (See page RS-187).
OK:
"COMPLETED" is displayed.
NEXT
(a) Using the intelligent tester, perform "Sensitivity check"
(See page RS-187).
Standard value:
27 to 33 kg (59.52 to 72.75 lb)
7 CHECK DTC
END
8 REPLACE OCCUPANT CLASSIFICATION ECU
9 PERFORM ZERO POINT CALIBRATION
10 PERFORM SENSITIVITY CHECK
RS–244
SUPPLEMENTAL RESTRAINT SYSTEM – OCCUPANT CLASSIFICATION SYSTEM
RS
NEXT
END
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Print one or all pages of your manual
$36.99
The 2009 Toyota Matrix Service & Repair Manual is a comprehensive guide for maintaining and repairing Toyota Matrix vehicles from the year 2009. It provides detailed instructions and diagrams to assist both professional mechanics and DIY enthusiasts in servicing and fixing various components of the vehicle.
Features:
- Step-by-step instructions for maintenance tasks
- Detailed diagrams and illustrations for easy understanding
- Information on troubleshooting and diagnostic procedures
- Covers various systems: engine, transmission, electrical, brakes, and more
- Includes specifications, torque values, and fluid capacities
- Compatible with a range of 2009 Toyota Matrix models
This manual is a valuable resource for anyone who owns or works on a 2009 Toyota Matrix. It provides all the necessary information to keep your vehicle running smoothly, saving time and money. Whether it's routine maintenance or a complex repair, the 2009 Toyota Matrix Service & Repair Manual is the ultimate companion for your Toyota Matrix.
